Canvas Cheat Sheet

HTML5 Canvas Cheat Sheet
HTML5 Canvas Text Font, Size, and Style Tutorial

HTML5 Canvas Grayscale Image Colors Tutorial

Discussion

To grayscale the colors of an image with HTML5 Canvas, we can iterate over all of the pixels in the image, calculate the brightness of each, and then set the red, green, and blue components equal to the brightness.

Note: The getImageData() method requires that the image is hosted on a web server with the same domain as the code executing it.  If this condition is not met, a SECURITY_ERR exception will be thrown.

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